CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (21,869)	$ (21,372)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property and equipment	22	22
Amortization of debt issuance costs	72	66
Amortization of discount/premium on investments	(1,191)	(2,096)
Share-based compensation	2,749	4,363
Lease-related amortization	(25)	(20)
Changes in operating assets and liabilities:
Accounts receivable	3	371
Prepaid expenses and other assets	2,280	441
Accounts payable and accrued liabilities	441	(4,000)
Net cash used in operating activities	(17,518)	(22,225)
Cash flows from investing activities:
Purchases of property and equipment	(27)	(62)
Purchases of short-term investments	(11,862)	0
Purchases of long-term investments	(29,236)	(6,803)
Proceeds from maturities of short-term investments	49,800	19,000
Net cash provided by investing activities	8,675	12,135
Cash flows from financing activities:
Proceeds from employee stock purchase plan	378	356
Payments of debt issuance costs	(170)	(157)
Net cash provided by financing activities	208	199
Net decrease in cash and cash equivalents	(8,635)	(9,891)
Cash and cash equivalents:
Beginning of period	27,661	25,842
End of period	$ 19,026	$ 15,951